iban validator function

iban_check.php

<?php

$iban = "DE89 3704 0044 0532 0130 00";

function getValidIban($iban)
{
    // normalize
    $iban = str_replace(array(' ', '-', '.', ','), '', strtoupper($iban));

    // define the pattern
    $pattern = '#(?P<value>((?=[0-9A-Z]{28}$)AL\d{10}[0-9A-Z]{16}$|^(?=[0-9A-Z]{24}$)AD\d{10}[0-9A-Z]{12}$|^(?=[0-9A-Z]{20}$)AT\d{18}$|^(?=[0-9A-Z]{22}$)BH\d{2}[A-Z]{4}[0-9A-Z]{14}$|^(?=[0-9A-Z]{16}$)BE\d{14}$|^(?=[0-9A-Z]{20}$)BA\d{18}$|^(?=[0-9A-Z]{22}$)BG\d{2}[A-Z]{4}\d{6}[0-9A-Z]{8}$|^(?=[0-9A-Z]{21}$)HR\d{19}$|^(?=[0-9A-Z]{28}$)CY\d{10}[0-9A-Z]{16}$|^(?=[0-9A-Z]{24}$)CZ\d{22}$|^(?=[0-9A-Z]{18}$)DK\d{16}$|^FO\d{16}$|^GL\d{16}$|^(?=[0-9A-Z]{28}$)DO\d{2}[0-9A-Z]{4}\d{20}$|^(?=[0-9A-Z]{20}$)EE\d{18}$|^(?=[0-9A-Z]{18}$)FI\d{16}$|^(?=[0-9A-Z]{27}$)FR\d{12}[0-9A-Z]{11}\d{2}$|^(?=[0-9A-Z]{22}$)GE\d{2}[A-Z]{2}\d{16}$|^(?=[0-9A-Z]{22}$)DE\d{20}$|^(?=[0-9A-Z]{23}$)GI\d{2}[A-Z]{4}[0-9A-Z]{15}$|^(?=[0-9A-Z]{27}$)GR\d{9}[0-9A-Z]{16}$|^(?=[0-9A-Z]{28}$)HU\d{26}$|^(?=[0-9A-Z]{26}$)IS\d{24}$|^(?=[0-9A-Z]{22}$)IE\d{2}[A-Z]{4}\d{14}$|^(?=[0-9A-Z]{23}$)IL\d{21}$|^(?=[0-9A-Z]{27}$)IT\d{2}[A-Z]\d{10}[0-9A-Z]{12}$|^(?=[0-9A-Z]{20}$)[A-Z]{2}\d{5}[0-9A-Z]{13}$|^(?=[0-9A-Z]{30}$)KW\d{2}[A-Z]{4}22!$|^(?=[0-9A-Z]{21}$)LV\d{2}[A-Z]{4}[0-9A-Z]{13}$|^(?=[0-9A-Z]{,28}$)LB\d{6}[0-9A-Z]{20}$|^(?=[0-9A-Z]{21}$)LI\d{7}[0-9A-Z]{12}$|^(?=[0-9A-Z]{20}$)LT\d{18}$|^(?=[0-9A-Z]{20}$)LU\d{5}[0-9A-Z]{13}$|^(?=[0-9A-Z]{19}$)MK\d{5}[0-9A-Z]{10}\d{2}$|^(?=[0-9A-Z]{31}$)MT\d{2}[A-Z]{4}\d{5}[0-9A-Z]{18}$|^(?=[0-9A-Z]{27}$)MR13\d{23}$|^(?=[0-9A-Z]{30}$)MU\d{2}[A-Z]{4}\d{19}[A-Z]{3}$|^(?=[0-9A-Z]{27}$)MC\d{12}[0-9A-Z]{11}\d{2}$|^(?=[0-9A-Z]{22}$)ME\d{20}$|^(?=[0-9A-Z]{18}$)NL\d{2}[A-Z]{4}\d{10}$|^(?=[0-9A-Z]{15}$)NO\d{13}$|^(?=[0-9A-Z]{28}$)PL\d{10}[0-9A-Z]{,16}n$|^(?=[0-9A-Z]{25}$)PT\d{23}$|^(?=[0-9A-Z]{24}$)RO\d{2}[A-Z]{4}[0-9A-Z]{16}$|^(?=[0-9A-Z]{27}$)SM\d{2}[A-Z]\d{10}[0-9A-Z]{12}$|^(?=[0-9A-Z]{,24}$)SA\d{4}[0-9A-Z]{18}$|^(?=[0-9A-Z]{22}$)RS\d{20}$|^(?=[0-9A-Z]{24}$)SK\d{22}$|^(?=[0-9A-Z]{19}$)SI\d{17}$|^(?=[0-9A-Z]{24}$)ES\d{22}$|^(?=[0-9A-Z]{24}$)SE\d{22}$|^(?=[0-9A-Z]{21}$)CH\d{7}[0-9A-Z]{12}$|^(?=[0-9A-Z]{24}$)TN59\d{20}$|^(?=[0-9A-Z]{26}$)TR\d{7}[0-9A-Z]{17}$|^(?=[0-9A-Z]{,23}$)AE\d{21}$|^(?=[0-9A-Z]{22}$)GB\d{2}[A-Z]{4}\d{14}))#';

    // check
    if(preg_match($pattern, $iban, $matches)) {
        return $matches['value'];
    }
    else {
        return false;
    }
}

if(($valid = getValidIban($iban))) {
    echo "\n\nMATCHING: {$valid}\n\n";
}
else {
    echo "\n\nNOT MATCHING!\n\n";
}

PL expression has an error ^PL\d{10}[0-9A-Z]{,16}n$ should be changed to: ^PL\d{10}[0-9A-Z]{0,16}$